Fix wcsdup malloc size

[izissise]

Other wcs* function expect a full sizeof(wchar_t) NUL char at the end of the string.

A quick grep -R "sizeof(wchar_t)" ./ shows no other obvious candidate for this change

[jart]

Thank you for spotting this and taking the time to send a PR.

Welcome as a new contributor. We need to go through one quick hurdle before we can proceed. Could you please email Justine Tunney [email protected] and say that you intend to assign her the copyright to the changes you contribute to Cosmopolitan?
Please send the email under your legal name rather than anonymously. Please use a real email account associated with your identity.
See CONTRIBUTING.md for further details. We make the ask because it helps us ship the tiniest most legally permissive prim and proper binaries.
You also only need to do it one time, so any future changes you send us can be quickly merged.

Thanks!